Welltech FXS SIP Gateway V.2.9 - Manual (Page 46)

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FXS Gateway Overview
Figure 5-4 ROM File Upgrade ok
Step 3. Click [Flash Clean] on the navigation panel. In the Flash Clean screen, click
the [CLEAN] button.
Figure 5-5 Flash Clean
Step 4. In the Flash Clean screen to Display [Flash cleaned!! Please
reboot your system!!], When the Flash Clean Ok.